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Pastimes : Dream Machine ( Build your own PC ) -- Ignore unavailable to you. Want to Upgrade?

To: Spots who wrote (7316)	4/27/1999 11:37:00 PM
From: Zeuspaul	Respond to of 14778

NT software RAID machine update If the drives can transfer data at anything near the controller speed, there's only going to be one drive at a time actually transferring data, I don't care how overlapped or overlappable other operations are, so this argument gets less force as the drives and controllers get smarter and faster Storage Review compared NT software RAID 0 to Promise Fastrack RAID 0 to non RAID. They used Maxtor IDE drives. Most Benchmarks were similar for Fastrack RAID and NT RAID. Most RAID Benchmarks were 20 %? +/- (the ? because I just looked at the numbers..I did not do any math so I will call it 20 % +/- 10 %) faster than standard harddrive benches. My interpretation of the results..as extrapolated? to a SCSI system is that the SCSI controller ( In the specific system I am working on) is not a limiting factor. IDE RAID (ref storagereview.com ) NT NT software RAID 0 transfer rate mb/sec begin 14.9 26.6 end 9.2 18.2 I interpret 'end' to be a sustained data transfer rate. I interpret 'begin' to include increased speed due to some kind of caching. The Cheetah SCSIs have a begin transfer rate of 19.1 mb/sec and a sustained rated of 12.6 mb/sec. Based on IDE results I would guess the begin rate will be 20 mb/sec and the sustained rate will be 24 mb/sec for the Cheetahs in NT software RAID 0. The SCSI LVD bus speed is 80 mb/sec. We set up a RAID 0 stripe between two physical SCSI Cheetahs. The OS is installed on a third physical Cheetah. If I understand correctly there will be three parallel operations?..or capable of. NT should be able to write to the pair in the stripe at the same time? and to itself? Does NT access the harddrive during OS types of operations? Should I install the apps on the C: drive or on the striped drive? (wrt this SCSI setup) Do that to the OS partition, and you're going to rebuild the system from scratch if something happens to any stripe. No plans on including the OS partition in a stripe..However I considered including a partition from the first drive in the stripe but opted instead to only stripe the second two drives. I doubt that you could make a successful drive image of it. Which drive? I have the same question. We looked at the drives with Drive Image. It did appear to be an option. Drive Image recognized the partition as a stripe and one could most likely create an image of the striped partition. Drive 2 and drive 3 both indicated striped partitions in Drive Image. My guess is it may work if one were to make an Image of each drive at the same time (well one after the other). My guess is one would also want to create an Image of the C: drive at the same time as well....maybe all the partitions in the machine.... this machine now is up to J with just harddrives/partitions. AND that does not include the 'independent' KOT/Win98 in the removable tray. I call it independent because I put it on the shelf when not in use....BUT I am not convinced it is 'independent'. There was one mysterious BSOD initiated in Disk Administrator after a KOT/ROMO swap. IMO NT is more inclined to be affected by drive swaps than Win9x. I have not had a chance to 'use' the machine yet but she does seem rather peppy, especially in NT. You can execute applications and format harddrives at the same time and not experience any jerky motion. (NT makes use of the second processor and?) Zeuspaul